See attached photo.....-21 Celsius and no creaking or cracking from the interior...I've had my truck for two years and the temperatures go from +40C to -40C.. I guess I'm lucky?? I've also not heard anyone I else know locally with these problems. Sent from my SM-N960W using Tapatalk

That's a good question. I don't really have an answer as far as what GM would be willing to do, or how the factory calibration is done. I would give service a call and see if they know anything about it. Sent from my SM-N960W using Tapatalk

I imagine the AT4/Trail Boss is already calibrated from factory. So are you asking if you got a non-AT4 or Trail Boss, and installed a lift, would they re-calibrate? Sent from my SM-N960W using Tapatalk

No worries. I'm in the same boat as you anyway. I am going to have the dealer swap over the stock Duratracs for 35" Duratracs on the stock 18" rim, and the last thing I want, is to rip the fender right off while turning. Hahaha!! Good luck and post photos once you get your truck! Sent from my SM-N960W using Tapatalk

"35x12.5x20 fuel MT is what we used.. the thing you need watch is the side lug and how big it is.." Above is quoted text regarding the tires. They fit with NO RUBBING. So I don't know what RC is talking about. Sent from my SM-N960W using Tapatalk

It's not mine. But I sent a message to the shop that did it, and they confirmed no trimming and that they fit. I don't have mine yet. It will be white though and I'll have the dealer swap the stock Duratracs for 35s. Sent from my SM-N960W using Tapatalk

Thanks for the in depth reply. It's an AT4 and I'm looking to use the stock 18x8.5" rim for the time being, but wrapping them with 35" tires. Let me know what you think as far as tire size goes.. I'd like to get the widest possible without rubbing. Sent from my SM-N960W using Tapatalk